In use the light value is taken from a table showing month and time of day. The sky condition is set against the light value. The subject or weather condition is set against the plate speed. The shutter speed and aperture pairs can then be read. Shown at the RPS exhibition in 1909.

In use the light value is found from a table based on month and time of day. This value is set against the subject type. An arrow will then point to a value, that value is moved to align with the plate in use. The shutter speed and aperture pairs can then be read. The instructions recommend that a strip of Solio paper is used as an actinometer to get the light value rather than use the table. John Albert Cheape also designed an actinometer around 1899.

This is a simple dial type calculator with easy-to-use finger notches, the design was later used by 'Johnsons of Hendon' for a range of similar calculators. A cine version of the Posometer was also available as were models in French and German.

These are for the photographer to record exposure details, subject and any additional notes. Plate manufacturers would often include a card in the box of plates giving details of the plates and space for the exposure details to be recorded. Photographer's diaries also had several pages to record the details. Some cameras, typically magazine types, had ivorine plaques which could be written on. Wratten introduced these plates in 1906, in 1912 they became part of Kodak.